Multi-Part Rail Wheel and Wheel Set for a Rail Vehicle, in Particular a Low-Floor Rail Vehicle

Abstract

A multi-part rail wheel having a wheel tire is presented and described, having a wheel body which consists of a light alloy material and has a hub opening in which a contact surface is provided, on which an outer ring of a roller bearing is supported during use or which is connected to the outer surface of a shaft or a shaft stub during use, and having at least one resilient body which is arranged between the wheel tire and the wheel body and via which the wheel tire is resiliently supported on the wheel body. In order to achieve a good corrosion resistance, a high resistance to mechanical influence and to avoid electrical damage in the wheel bearing, it is proposed that at least the contact surface in the hub opening of the wheel body be covered with an electrically insulating oxide layer (OX) generated by electrochemical anodizing. A wheel set for a rail vehicle, having such rail wheels, is also presented and described.

1 . A multi-part rail wheel having a wheel tire, having a wheel body which consists of a light alloy material and has a hub opening in which a contact surface is provided, on which an outer ring of a roller bearing is supported during use or which is connected to the outer surface of a shaft or a shaft stub during use, and having at least one resilient body which is arranged between the wheel tire and the wheel body and via which the wheel tire is resiliently supported on the wheel body, wherein at least the contact surface in the hub opening of the wheel body is covered with an oxide layer (OX) generated by electrochemical anodizing. 
     
     
         2 . A wheel according to  claim 1 , wherein the contact surface forms a section of an inner surface of the hub opening of the wheel body and in that the inner surface of the hub opening is covered entirely with the oxide layer (OX) generated by electrochemical anodizing. 
     
     
         3 . The rail wheel according to  claim 1 , wherein at least a section of an outer surface of the wheel body is also covered with the oxide layer (OX) generated by electrochemical anodizing. 
     
     
         4 . The rail wheel according to  claim 1 , wherein a clamping means, which consists of a light alloy material and is clamped against the wheel body, is provided in order to clamp the resilient body between the wheel tire and the wheel body. 
     
     
         5 . The rail wheel according to  claim 4 , wherein the clamping means is covered with an oxide layer (OX) generated by electrochemical anodizing at least in the region of its surface that comes in contact with the resilient body. 
     
     
         6 . The rail wheel according to  claim 3 , wherein a connecting zone for connecting an electrically conductive cable connection is provided on the outer surface of the wheel body and/or the outer surface of the clamping means and in that the respective outer surface with the exception of the connecting zone is fully covered with the oxide layer (OX) generated by electrochemical anodizing. 
     
     
         7 . The rail wheel according to  claim 1 , wherein the thickness of the oxide layer (OX) respectively present is from 10 μm to 160 μm. 
     
     
         8 . The rail wheel according to  claim 1 , wherein the wheel body consists of an aluminium material and the oxide layer (OX) generated by electrochemical anodizing consists of at least 87.1% by mass Al 2 O 3  and a remainder of other oxides, which are formed in the course of electrochemical anodizing from oxide-forming alloy constituents that are contained in addition to aluminium in the aluminium material of the wheel body. 
     
     
         9 . A wheel set for a rail vehicle, having two rail wheels formed according to  claim 1 . 
     
     
         10 . The wheel set according to  claim 9 , wherein the rail wheels are connected with their contact surface to the outer surface of a shaft or a shaft stub. 
     
     
         11 . The wheel set according to  claim 9  for a low-floor rail vehicle, having a portal axle, having an axle middle part extending along a longitudinal axis and two axle journals, one of which is seated on a first end section of the axle middle part and a second of which is seated on a second end section of the axle middle part, which is formed opposite to the first end section, the axle journals being aligned facing outwards from the axle middle part, and having two rail wheels formed according to  one of the preceding claims , which are rotatably mounted in floating bearing on the axle journal of the portal axle in each case via at least one roller bearing which is seated with an inner ring on the respective axle journal and bears with a circumferential surface of an outer ring on the contact surface, which is provided in the hub opening of the wheel body of the rail wheel 
     
     
         12 . The wheel set according to  claim 11 , wherein the rail wheels are in each case rotatably mounted on their assigned axle journal of the portal axle by means of two roller bearings and in that a contact surface in the hub opening of the wheel body of the rail wheels is assigned to each roller bearing.